How do I convert AFP from IU/mL to ng/mL?

ng/mL = IU/mL × 1.21. For example, 4 IU/mL equals 4.84 ng/mL.

How many ng/mL are 4 IU/mL?

4 IU/mL equal 4.84 ng/mL (AFP).

Tumor markers

ng/mL = IU/mL × 1.21

Enter a value in any unit and all other units fill in.

IU/mL ng/mL

IU/mL → ng/mL	ng/mL = IU/mL × 1.21
ng/mL → IU/mL	IU/mL = ng/mL × 0.8264

Highlighted: values inside the adult reference range.

0.5785 – 7.686 IU/mL = 0.7 – 9.3 ng/mL

Source: MedlinePlus (NLM): Alpha-fetoprotein · Last reviewed: 2026-10-14